I had this question on my mind for a while, but which of these two type of Mind Control could be the best and why?

I guess it could be the Tech Control, due to the variety of ways to control. But maybe the Magic could be powerful to control the sub.

I'm interested in your thoughts and which could be the best.

I'd say they're mostly the same thing beyond their aesthetic differences.

Magic is often more about ritualism and incantations, while technology has its grounding in real-world sciences. Both depend on mysteriousness in their overall appeal.

The more advanced the science, the more it lends itself to the imagination. Magic, on the other hand, is arcane by default, so you might want to explain a bit more about how it works without going into too much detail.

All in all, I like them equally. They both have considerable potential.

Microchip on the forehead versus a binding rune on the forehead.
A remote control versus a voodoo doll.
Scientist versus sorcerer.

Wasn't there an event about this idea with some posts making it to the hub a few years back

I prefer magic since i like hypnosis with fantasy. If it becomes closer to real life i dont like it.

I'm neutral, I like me both. On the other hand, instant hypnosis app is something that I feel is tad overused.

Tech Control - A gift blessed by the Omnissiah
Magic Control - Filthy heretic witchcraft coming from the Chaos Gods

Do I need to say more? *Loads plasma pistol with Comissarial intent*

I did not expect 40k in this sub, but a pleasant surprise nonetheless

*Smashes door*

NOBODY EXPECTS THE IMPERIUM INQUISITION!!!

Technology all the way....specially when the target of the control is a magic user....Something as "mundane" as technology being able to overcome heroines and other strong willed subs makes it very exciting, I'm just a big sci-fi fan.
Also it tends to have more limitations and the explanations of the mechanisms behind it can be also be an interesting part of it.